MUON/mapping/AliMpGraphContext.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 // $Id$
  17 // $MpId: AliMpGraphContext.cxx,v 1.11 2006/05/24 13:58:32 ivana Exp $
  18 // Category: graphics
  19 //
  20 // Class AliMpGraphContext
  21 // -----------------------
  22 // Class describing a the correspondance between a given area
  23 // in pad, and a zone of real (cm) position
  24 // Included in AliRoot: 2003/05/02
  25 // Author: David GUEZ, IPN Orsay
  26
  27 #include "AliMpGraphContext.h"
  28
  29 /// \cond CLASSIMP
  30 ClassImp(AliMpGraphContext)
  31 /// \endcond
  32
  33 AliMpGraphContext *AliMpGraphContext::fgInstance = 0;
  34 AliMpGraphContext::GraphContextVector AliMpGraphContext::fgStack;
  35
  36 #ifdef WITH_ROOT
  37 Int_t              AliMpGraphContext::fgStackSize = 0;
  38 #endif
  39
  40 //_____________________________________________________________________________
  41 AliMpGraphContext::AliMpGraphContext():
  42   TObject(),
  43   fPadPosition(TVector2(0.5,0.5)),
  44   fPadDimensions(TVector2(0.49,0.49)),
  45   fRealPosition(TVector2(0.,0.)),
  46   fRealDimensions(TVector2(1,1))
  47 {
  48 /// Private constructor
  49
  50   fColor = 20;
  51   // default constructor (private)
  52 }
  53
  54 //_____________________________________________________________________________
  55 AliMpGraphContext::AliMpGraphContext(const AliMpGraphContext& right)
  56   : TObject(right),
  57     fColor(right.fColor),
  58     fPadPosition(right.fPadPosition),
  59     fPadDimensions(right.fPadDimensions),
  60     fRealPosition(right.fRealPosition),
  61     fRealDimensions(right.fRealDimensions)
  62 {
  63 /// Copy constructor
  64 }
  65
  66 //_____________________________________________________________________________
  67 AliMpGraphContext&
  68 AliMpGraphContext::operator=(const AliMpGraphContext& right)
  69 {
  70 /// Protected assignment operator
  71
  72   // check assignment to self
  73   if (this == &right) return *this;
  74
  75   fColor = right.fColor;
  76   fPadPosition = right.fPadPosition;
  77   fPadDimensions = right.fPadDimensions;
  78   fRealPosition = right.fRealPosition;
  79   fRealDimensions = right.fRealDimensions;
  80
  81   return *this;
  82 }
  83
  84 //_____________________________________________________________________________
  85 AliMpGraphContext *AliMpGraphContext::Instance()
  86 {
  87   /// Return or create a unique instance of this class
  88
  89   if (fgInstance) return fgInstance;
  90   fgInstance = new AliMpGraphContext;
  91   return fgInstance;
  92 }
  93
  94 //_____________________________________________________________________________
  95 TVector2 AliMpGraphContext::RealToPad(const TVector2 &position) const
  96 {
  97   /// Transform a real position into its equivalent position in the pad
  98
  99   Double_t x=position.X();
 100   Double_t y=position.Y();
 101   x-= (fRealPosition.X()-fRealDimensions.X());
 102   x/=fRealDimensions.X();
 103   x*=fPadDimensions.X();
 104   x+= (fPadPosition.X()-fPadDimensions.X() );
 105
 106   y-= (fRealPosition.Y()-fRealDimensions.Y());
 107   y/=fRealDimensions.Y();
 108   y*=fPadDimensions.Y();
 109   y+= (fPadPosition.Y()-fPadDimensions.Y() );
 110
 111   return TVector2(x,y);
 112 }
 113
 114 //_____________________________________________________________________________
 115 void AliMpGraphContext::RealToPad(const TVector2 &position,
 116                               const TVector2 &dimensions,
 117                               TVector2 &padPosition,
 118                               TVector2 &padDimensions) const
 119 {
 120   // Transform the real area (position,dimensions) to
 121   // its equivalent pad area
 122
 123   padPosition = RealToPad(position);
 124   padDimensions =
 125     TVector2(dimensions.X()*fPadDimensions.X()/fRealDimensions.X(),
 126              dimensions.Y()*fPadDimensions.Y()/fRealDimensions.Y());
 127
 128 }
 129
 130 //_____________________________________________________________________________
 131 void AliMpGraphContext::SetPadPosForReal(const TVector2 &position,
 132                                      const TVector2 &dimensions)
 133 {
 134   /// Set the pad area from the actual one
 135   /// corresponding to the given real area.
 136
 137   RealToPad(position,dimensions,fPadPosition,fPadDimensions);
 138 }
 139
 140 //_____________________________________________________________________________
 141 void AliMpGraphContext::Push() const
 142 {
 143   /// Store the current configuration
 144
 145   AliMpGraphContext *save = new AliMpGraphContext(*this);
 146
 147 #ifdef WITH_STL
 148   fgStack.push_back(save);
 149 #endif
 150
 151 #ifdef WITH_ROOT
 152   fgStack.AddAt(save, fgStackSize++);
 153 #endif
 154 }
 155
 156 //_____________________________________________________________________________
 157 void AliMpGraphContext::Pop()
 158 {
 159 /// Pop an object from the stack.
 160
 161 #ifdef WITH_STL
 162   // restore the last saved configuration
 163   if (!fgStack.empty()){
 164     AliMpGraphContext *obj = fgStack.back();
 165     *this = *obj;
 166     fgStack.pop_back();
 167     delete obj;
 168   }
 169 #endif
 170
 171 #ifdef WITH_ROOT
 172   // restore the last saved configuration
 173   if ( fgStackSize ){
 174     AliMpGraphContext *obj
 175       = (AliMpGraphContext*)fgStack.At(--fgStackSize);
 176     *this = *obj;
 177     fgStack.RemoveAt(fgStackSize);
 178     delete obj;
 179   }
 180 #endif
 181 }